WO2020075341A1 - Véhicule de travail - Google Patents

Véhicule de travail Download PDF

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Publication number
WO2020075341A1
WO2020075341A1 PCT/JP2019/022594 JP2019022594W WO2020075341A1 WO 2020075341 A1 WO2020075341 A1 WO 2020075341A1 JP 2019022594 W JP2019022594 W JP 2019022594W WO 2020075341 A1 WO2020075341 A1 WO 2020075341A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
upper frame
swing
work vehicle
divided body
Prior art date
Application number
PCT/JP2019/022594
Other languages
English (en)
Japanese (ja)
Inventor
正典 東
輝政 小林
永井　宏樹
知央 山本
Original Assignee
株式会社クボタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018193194A external-priority patent/JP7005465B2/ja
Priority claimed from JP2018213064A external-priority patent/JP6959213B2/ja
Application filed by 株式会社クボタ filed Critical 株式会社クボタ
Priority to US17/282,784 priority Critical patent/US11414035B2/en
Priority to EP19871966.8A priority patent/EP3865353B1/fr
Publication of WO2020075341A1 publication Critical patent/WO2020075341A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/13—Roll-over protection
    • B60R21/131—Protective devices for drivers in case of overturning of tractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D33/00—Superstructures for load-carrying vehicles
    • B62D33/06—Drivers' cabs
    • B62D33/0617—Drivers' cabs for tractors or off-the-road vehicles
    • B62D33/0625—Drivers' cabs for tractors or off-the-road vehicles open
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D49/00—Tractors
    • B62D49/06—Tractors adapted for multi-purpose use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R2021/0002—Type of accident
    • B60R2021/0018—Roll-over
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R2021/0065—Type of vehicles
    • B60R2021/0074—Utility vehicles
    • B60R2021/0076—Agricultural vehicles, e.g. tractors

Definitions

  • the present invention relates to the technology of work vehicles such as tractors.
  • Patent Document 1 the technology of the protective frame provided on work vehicles such as tractors has been publicly known. For example, it is as described in Patent Document 1.
  • Patent Document 1 describes a configuration in which a fall protection frame is provided behind the seat of the traveling aircraft.
  • the fall protection frame is configured such that a movable frame is rotatably connected to a fixed frame that is erected on the traveling machine body side.
  • the fall protection frame is configured so that the posture can be freely changed between a standing posture in which the movable frame is erected with respect to the fixed frame and a retracted posture in which the movable frame is folded downward with respect to the fixed frame. ing.
  • the bolts and nuts that connect the fixed side frame and the movable side frame rotatably (swingably) are tightened to move the movable side frame.
  • the present invention has been made in view of the above circumstances, and a problem to be solved by the present invention is to provide a work vehicle capable of reducing the force required for the swinging operation of the protection frame provided behind the seat. Is to provide.
  • the work vehicle of the present invention is a work vehicle including a protection frame having a first frame and a second frame rotatably connected to an upper portion of the first frame, It is provided with an assist mechanism for assisting the turning operation of the second frame.
  • the first frame is a lower frame fixed to the rear of the seat, and the second frame is swingably connected to the upper part of the lower frame via a swing shaft.
  • the upper frame is configured to be displaceable between an upright position standing above the lower frame and a lying position folded with respect to the lower frame by a swinging operation. is there.
  • the assist mechanism includes a biasing mechanism capable of biasing the upper frame toward the standing position side in the swinging direction of the upper frame.
  • the assist mechanism is configured such that, in a state where the upper frame is located closer to the fall position than a boundary position between the upright position and the fall position, the upright mechanism applies the upright mechanism to the upper frame.
  • the assist mechanism includes an upper connecting shaft that rotatably connects the upper frame and the urging mechanism, and a lower connecting shaft that rotatably connects the lower frame and the urging mechanism.
  • the biasing mechanism is expandable and contractable, and is configured to bias the upper connecting shaft and the lower connecting shaft so as to separate from each other along the expanding and contracting direction, the upper connecting shaft, In a state in which the upper frame is in the upright position, the upper frame is located on the upright position side in the swing direction with respect to a straight line passing through the lower connecting shaft and the swing shaft in a side view. In the lying position, the lying position is on the lying position side in the swing direction with respect to the straight line.
  • the assist mechanism includes a connecting member that is rotatably connected to the urging mechanism via the upper connecting shaft, and a screw that fixes the connecting member to the upper frame. Is configured such that the screw can be inserted in the expansion and contraction direction of the biasing mechanism, and the screw is screwed into the upper frame side to hold the biasing mechanism in a contracted state.
  • the screw has an axis line along the insertion direction of the screw and an axis line along the expansion / contraction direction of the biasing mechanism in a state where the upper frame is located at a predetermined position in the swing direction. It is provided so as to match.
  • the connecting member is provided with a notch portion that avoids at least a part of the biasing mechanism when the upper frame is in the lying position.
  • the urging mechanism is a damper mechanism having an urging force of a spring.
  • the assist mechanism is positioned outside the upper frame and the lower frame in the left-right direction.
  • the assist mechanism is located on the inner side in the left-right direction than the outer end in the left-right direction of the fender arranged so as to cover the rear wheel of the work vehicle.
  • the end portion on the side opposite to the lower frame is located below the lower end of the assist mechanism in the lying position.
  • the protection frame is divided into a lower divided body as the first frame located on the vehicle body side and an upper divided body as the second frame located on the upper side, and the upper divided body is formed.
  • a position holding mechanism that is attached so as to be in a free state in which neither extension force nor contraction force is generated, and that is capable of fixing and releasing the upper divided body at a rotation position corresponding to the intermediate position. It is those who are.
  • the upper divided body has a first rotation position corresponding to the vertically acting posture, a second rotation position corresponding to the intermediate position, and a first rotation position corresponding to the folding posture.
  • the position holding mechanism is rotatably supported over three rotation positions, and the position holding mechanism can fix and release the position at each of the first rotation position, the second rotation position, and the third rotation position. Is what is.
  • the position holding mechanism includes a connecting pin that is removably inserted over an insertion hole formed in the upper divided body and an insertion hole formed in the lower divided body, and the upper divided body
  • a plurality of body-side insertion holes or the lower divided body-side insertion holes are formed at different positions in the circumferential direction, and the connecting pin is inserted by replacing the connection pin with any of the plurality of insertion holes.
  • the position can be held in each of the first rotation position, the second rotation position, and the third rotation position.
  • the swinging operation of the upper frame can be assisted by utilizing the biasing force of the biasing mechanism.
  • the force required to swing the protective frame can be further reduced.
  • the attachment of the biasing mechanism to the upper frame can be improved.
  • the structure of the biasing mechanism can be simplified.
  • the position of the assist mechanism can be set to a suitable position.
  • the assist mechanism can suppress contact with surrounding objects.
  • the protection frame can be made compact in the front-rear direction.
  • the structure of the position holding mechanism can be simplified.
  • FIG. 3 is an enlarged perspective view showing a connecting portion between an upper frame and a lower frame.
  • FIG. 6 is an enlarged perspective view showing an upper end portion of the damper mechanism in a state where the upper frame is in a lying position. It is the whole tractor side view concerning a second embodiment. It is the whole tractor top view. It is a rear view of a tractor. It is a disassembled perspective view of LOPS.
  • the tractor 101 is exemplified as the work vehicle, but the present invention is not limited to this. That is, the work vehicle may be another agricultural vehicle, construction vehicle, industrial vehicle, or the like.
  • the tractor 101 mainly includes a body frame 102, a front wheel 103, an engine 104, a bonnet 105, a mission case 106, a rear wheel 107, a fender 108, a driver's seat 109, a protective frame 110, and an assist mechanism 120.
  • the body frame 102 is arranged with its longitudinal direction oriented in the front-rear direction, as shown in FIG.
  • the front portion of the machine body frame 102 is supported by a pair of left and right front wheels 103 via a front axle mechanism (not shown).
  • An engine 104 is provided at the front of the machine body frame 102.
  • the engine 104 is covered by the bonnet 105.
  • a mission case 106 shown in FIGS. 1 and 2 is provided at the rear of the machine frame 102.
  • the mission case 106 contains a transmission (not shown) and the like.
  • the mission case 106 is supported by a pair of left and right rear wheels 107 via a rear axle mechanism (not shown).
  • the rear wheel 107 is covered from above by the left and right fenders 108.
  • the power of the engine 104 is transmitted to the front wheels 103 via the front axle mechanism after being shifted by the transmission, and is also transmittable to the rear wheels 107 via the rear axle mechanism.
  • the front wheel 103 and the rear wheel 107 are rotationally driven by the power of the engine 104, and the tractor 101 can travel.
  • the driver's seat 109 is a portion on which the driver boards.
  • the driver's seat 109 is located behind the engine 104.
  • a steering wheel 109a for adjusting the turning angle of the front wheels 103, a seat 109b for the driver to sit on various operating tools such as a brake pedal, an accelerator pedal, a clutch pedal and the like are arranged.
  • the protection frame 110 is a frame for protecting the driver who is in the driver's seat 109 when the tractor 101 falls. As will be described later, the protection frame 110 is configured such that the upper frame 114 on the upper side can swing with respect to the lower frame 111 on the lower side. The swinging operation of the protection frame 110 (upper frame 114) can be manually performed by the operator. The assist mechanism 120 assists the swing operation of the protection frame 110.
  • the assist mechanism 120 assists the swing operation of the protection frame 110.
  • the protection frame 110 is provided behind seat 109b.
  • the protection frame 110 includes a lower frame 111, an upper frame 114, a swing shaft 117, and a fixing pin 118.
  • the lower frame 111 shown in FIGS. 2 to 6 constitutes a lower portion of the protective frame 110.
  • the lower frame 111 is fixed to the mission case 106 behind the seat 109b.
  • a pair of lower frames 111 are provided so as to extend upward from the left and right sides of the mission case 106, respectively.
  • the lower frame 111 includes a lower first member 111a, a lower second member 111b, a joint member 111c, a lower damper connecting portion 112, and an upper frame connecting portion 113.
  • the lower first member 111 a shown in FIGS. 2 to 4 constitutes a lower portion of the lower frame 111.
  • the lower first member 111a is formed so as to be fixed to the mission case 106 and extend upward.
  • the lower first member 111 a projects upward so as to penetrate through the opening formed in the fender 108, and the upper end portion is located above the fender 108.
  • the lower first member 111a is formed of a rectangular steel pipe.
  • the lower second member 111b constitutes an upper portion of the lower frame 111.
  • the lower second member 111b is formed so as to extend upward from the upper end of the lower first member 111a.
  • a lower end of the lower second member 111b is connected to an upper end of the lower first member 111a.
  • the lower second member 111b is formed of a rectangular steel pipe.
  • the joint member 111c shown in FIG. 4 connects the lower first member 111a and the lower second member 111b.
  • the joint member 111c is arranged so as to straddle the boundary between the lower first member 111a and the lower second member 111b.
  • the joint member 111c is L-shaped in a plan view, and covers the outer surface in the left-right direction of the lower first member 111a and the second lower member 111b (the surface facing the outer side with respect to the center of the tractor 101 in the lateral direction) and the rear surface. Is arranged as.
  • the joint member 111c is fixed to the lower first member 111a and the lower second member 111b, respectively.
  • the lower damper connecting portion 112 is a portion to which a lower end portion of a damper mechanism 121 described later is connected.
  • the lower damper connecting portion 112 is provided on the joint member 111c of the right lower frame 111 of the pair of lower frames 111.
  • the lower damper connecting portion 112 is provided so as to project rightward from the right surface of the joint member 111c.
  • the lower damper connecting portion 112 is U-shaped in a plan view and is arranged so as to open rearward.
  • the left end of the lower damper connecting portion 112 is fixed to the outer surface in the left-right direction of the joint member 111c, and the right end thereof is connected to the damper mechanism 121.
  • a hole portion (not shown) into which a lower connecting shaft 125 described later is inserted is formed.
  • the upper frame connecting portion 113 shown in FIGS. 5 and 6 is a portion to which an upper frame 114 described later is connected.
  • the upper frame connecting portion 113 is provided at the upper end of the lower second member 111b.
  • the upper frame connecting portion 113 is U-shaped in a plan view and is arranged so as to open rearward.
  • the upper frame connecting portion 113 is arranged so as to accommodate the upper end portion of the lower second member 111b inside the opening.
  • the upper frame connecting portion 113 is arranged so as to cover the outer surface in the left-right direction, the inner surface in the left-right direction, and the front surface of the upper end portion of the lower second member 111b.
  • the rear portion of the upper frame connecting portion 113 has a shape protruding rearward with respect to the upper end portion of the lower second member 111b.
  • the upper frame connecting portion 113 includes a shaft hole 113a, a first pin insertion hole 113b, and a second pin insertion hole 113c.
  • the shaft hole 113a is a hole into which a swing shaft 117 described later is inserted.
  • the shaft hole 113a is provided so as to penetrate in the left-right direction.
  • the shaft hole 113a is provided substantially at the center of the upper frame connecting portion 113 in the front-rear direction.
  • the first pin insertion hole 113b is a hole through which a fixing pin 118 described later is inserted at the standing position P4.
  • the first pin insertion hole 113b is provided so as to penetrate in the left-right direction.
  • the first pin insertion hole 113b is provided in front of the shaft hole 113a.
  • the second pin insertion hole 113c is a hole through which a fixed pin 118 described later is inserted at the fall position P1.
  • the second pin insertion hole 113c is provided so as to penetrate in the left-right direction.
  • the second pin insertion hole 113c is provided behind the shaft hole 113a.
  • the upper frame 114 shown in FIGS. 2, 3, 6, and 8 constitutes the upper portion of the protective frame 110.
  • the upper frame 114 is connected to the upper frame connecting portion 113 of the lower frame 111 via a swing shaft 117 described later so as to be swingable in the front-rear direction.
  • the upper frame 114 can be displaced between an upright position P4 that stands up above the lower frame 111 and a fall position P1 that is folded with respect to the lower frame 111 as shown in FIG. It is said that
  • the upper frame 114 is formed of a rectangular steel pipe like the lower second member 111b and the lower first member 111a of the lower frame 111.
  • the upper frame 114 is U-shaped in rear view at the upright position P4, and a pair of end portions on the opening side (end portions on the lower frame 111 side) have a pair of lower frames 111. Are respectively connected to the upper frame connecting portions 113 of. The end of the upper frame 114 on the lower frame 111 side is housed inside the opening of the upper frame connecting portion 113.
  • the lower portion (the lower frame 111 side portion) extends upward from the lower frame 111 in the vertical position in the state where the upper frame 114 is in the standing position P4. It is said that. Further, in the upper frame 114 in the standing position P4, the upper part (the part on the side opposite the lower frame) is bent forward. The upper frame 114 is in the standing position P4, and the front surface of the end portion on the lower frame 111 side contacts the inside of the upper frame connecting portion 113.
  • the upper frame 114 includes an upper damper connecting portion 115 and a tubular portion 116.
  • the upper damper connecting portion 115 shown in FIGS. 5 to 9 is a portion to which a connecting member 130 described later is connected.
  • the upper damper connecting portion 115 is provided so as to project rightward from the right surface of the upper frame 114.
  • the upper damper connecting portion 115 has a plate shape whose thickness direction extends in the vertical direction at the standing position P4, and has a shape in which the front end portion is bent downward.
  • the upper damper connecting portion 115 includes a first bolt insertion hole 115a and a second bolt insertion hole 115b.
  • the first bolt insertion hole 115a is a hole that vertically penetrates the upper damper connecting portion 115 at the standing position P4.
  • a first bolt 134a which will be described later, can be inserted into the first bolt insertion hole 115a.
  • the first bolt insertion hole 115a is formed in the rear portion of the upper damper connecting portion 115.
  • the second bolt insertion hole 115b is a hole that vertically penetrates the upper damper connecting portion 115 at the standing position P4.
  • a second bolt 135a which will be described later, can be inserted into the second bolt insertion hole 115b.
  • the second bolt insertion hole 115b is formed in front of the first bolt insertion hole 115a.
  • the tubular portion 116 shown in FIGS. 5 and 8 has a swing shaft 117, which will be described later, inserted therein.
  • the tubular portion 116 is provided on the rear surface at the end portion on the lower frame 111 side of the upper frame 114.
  • the tubular portion 116 has a cylindrical shape having a hole penetrating in the left-right direction.
  • the tubular portion 116 is arranged such that the hole overlaps with the shaft hole 113a of the upper frame connecting portion 113 in a side view.
  • a hole (not shown) that overlaps with the first pin insertion hole 113b in a side view and a lying position P1 are provided in a state of being in the standing position P4. In this state, a hole (not shown) that overlaps with the second pin insertion hole 113c in a side view is formed.
  • a swing shaft 117 shown in FIGS. 5 to 8 connects the lower frame 111 and the upper frame 114 so as to be swingable.
  • the swing shaft 117 is arranged with its axial direction oriented in the left-right direction. As shown in FIG. 8, the swing shaft 117 is inserted into the shaft hole 113a of the upper frame connecting portion 113 and the hole formed in the tubular portion 116 of the upper frame 114.
  • the illustrated example shows an example in which the swing shaft 117 is configured by bolts inserted through the shaft hole 113a and the hole formed in the tubular portion 116.
  • the bolt is attached to the lower frame 111 and the upper frame 114 by fastening a nut in a state where the bolt is inserted into the shaft hole 113a and the hole formed in the tubular portion 116.
  • the fixing pin 118 regulates the swing of the upper frame 114 which is set to the standing position P4 or the fall position P1.
  • the fixing pin 118 has a columnar shape with the axial direction directed in the left-right direction.
  • the fixing pin 118 is detachably inserted into the lower frame 111 and the upper frame 114 via the first pin insertion hole 113b and the second pin insertion hole 113c of the upper frame connecting portion 113.
  • the example shown in the figure shows an example in which a handle is provided at one end of the fixed pin 118 in the left-right direction. Further, the fixing pin 118 is provided with a retainer (not shown) for the lower frame 111 and the upper frame 114 at the other end in the left-right direction.
  • the fixing pin 118 is inserted into the first pin insertion hole 113b and the hole formed in the upper frame 114, whereby the upright position P4 is obtained.
  • the swing of the upper frame 114 can be restricted.
  • the fixing pin 118 is inserted into the second pin insertion hole 113c and the hole formed in the upper frame 114, so that the lying position P1 is set. It is possible to regulate the swinging of the upper frame 114 thus formed.
  • the assist mechanism 120 shown in FIGS. 2 to 8 assists the swing operation of the upper frame 114 by biasing the upper frame 114 in the swing direction.
  • the assist mechanism 120 is provided on the right side of the protection frame 110.
  • the assist mechanism 120 includes a damper mechanism 121, a connecting member 130, a first stopper 134, and a second stopper 135. Unless otherwise noted, the assist mechanism 120 will be described below with reference to the state where the upper frame 114 is in the standing position P4.
  • the damper mechanism 121 is expandable and contractable, and urges the upper frame 114 in the extension direction.
  • the damper mechanism 121 is rotatably connected to the lower frame 111 and the upper frame 114.
  • the assist mechanism 120 is arranged with its longitudinal direction oriented vertically.
  • the damper mechanism 121 constitutes a gas spring that biases the upper frame 114 by the pressure of the gas enclosed inside.
  • the damper mechanism 121 includes a cylinder tube 122 and a piston rod 124.
  • the cylinder tube 122 shown in FIG. 5 constitutes the upper part of the damper mechanism 121.
  • the cylinder tube 122 is a cylindrical member in which gas is enclosed.
  • the cylinder tube 122 is rotatably connected to the upper frame 114 via a connecting member 130 described later.
  • the cylinder tube 122 has an upper connecting shaft 123.
  • the upper connecting shaft 123 is a shaft rotatably connected to a connecting member 130 described later.
  • the upper connecting shaft 123 connects the upper end of the cylinder tube 122 and the connecting member 130.
  • the upper connecting shaft 123 is a substantially columnar pin-shaped member.
  • the upper connecting shaft 123 is arranged with its axial direction directed in the left-right direction.
  • the piston rod 124 shown in FIG. 4 constitutes the lower part of the damper mechanism 121.
  • the piston rod 124 is a substantially cylindrical member that can be housed inside the cylinder tube 122.
  • the piston rod 124 receives the pressure of the gas sealed in the cylinder tube 122, the piston rod 124 is urged in the direction in which it projects with respect to the cylinder tube 122 (the direction in which the damper mechanism 121 extends). Further, the piston rod 124 can be displaced against the pressure of the gas sealed in the cylinder tube 122 in the direction of being housed inside the cylinder tube 122 (the direction in which the damper mechanism 121 contracts).
  • the piston rod 124 has a lower connecting shaft 125.
  • the lower connecting shaft 125 is a shaft that is rotatably connected to the lower frame 111.
  • the lower connecting shaft 125 connects the lower end of the piston rod 124 and the lower damper connecting portion 112 of the lower frame 111.
  • the lower connecting shaft 125 is a substantially columnar pin-shaped member.
  • the lower connecting shaft 125 is arranged with its axial direction oriented in the left-right direction. As shown in FIG. 4, the lower connecting shaft 125 is connected to the lower damper connecting portion 112 by being inserted into the hole formed at the right end portion of the lower damper connecting portion 112.
  • the damper mechanism 121 is configured to urge the upper connecting shaft 123 and the lower connecting shaft 125 so as to separate from each other in the extension direction.
  • the damper mechanism 121 expands and contracts as the upper frame 114 swings while being connected to the upper frame 114 and the lower frame 111.
  • the connecting member 130 shown in FIGS. 5 to 11 connects the upper frame 114 and the piston rod 124.
  • the connecting member 130 includes a connecting piece 131, a fixed piece 132, and a cutout 133.
  • the connecting piece 131 is a part to which the upper end of the cylinder tube 122 is connected via the upper connecting shaft 123.
  • the connecting piece portion 131 is arranged such that the thickness direction thereof is along the left-right direction.
  • the connecting piece portion 131 includes a hole portion 131a into which the upper connecting shaft 123 is inserted.
  • the hole 131a is provided in the rear portion of the connecting piece 131 so as to penetrate in the left-right direction.
  • the fixing piece portion 132 is a portion connected to the upper damper connecting portion 115 of the upper frame 114.
  • the connecting piece portion 131 is arranged such that the thickness direction thereof is along the vertical direction.
  • the fixing piece portion 132 is provided so as to extend leftward from the upper end of the connecting piece portion 131.
  • the fixing member 132 and the upper connecting shaft 123 make the connecting member 130 L-shaped in a front view.
  • the connecting member 130 is formed by bending a plate made of a metal material.
  • the fixed piece portion 132 includes a first bolt insertion hole 132a and a second bolt insertion hole 132b.
  • the first bolt insertion hole 132a is a hole that vertically penetrates the fixed piece portion 132.
  • a first bolt 134a which will be described later, can be inserted into the first bolt insertion hole 132a.
  • the first bolt insertion hole 132a is formed in the rear portion of the fixed piece portion 132.
  • the first bolt insertion hole 132a is located on the axis of the damper mechanism 121 in a side view.
  • the second bolt insertion hole 132b is a hole that vertically penetrates the fixing piece portion 132.
  • a second bolt 135a described later can be inserted into the second bolt insertion hole 132b.
  • the second bolt insertion hole 132b is formed in the fixed piece portion 132 in front of the first bolt insertion hole 132a.
  • the notch 133 shown in FIGS. 8, 9 and 15 is a part of the connecting member 130 that is notched.
  • the cutout portion 133 is formed so as to avoid interference with the upper end portion of the cylinder tube 122 when the upper frame 114 is in the collapsed position P1.
  • the cutout portion 133 is formed by cutting out a connecting portion between the connecting piece portion 131 and the fixed piece portion 132.
  • the cutout portion 133 has a shape obtained by cutting out a portion of the connecting portion that forms the right rear corner portion of the connecting member 130.
  • the cutout portion 133 has a shape that avoids at least a portion overlapping with the upper end portion of the cylinder tube 122 in a plan view.
  • the first stopper 134 fastens the fixing piece portion 132 of the connecting member 130 and the upper damper connecting portion 115 of the upper frame 114.
  • the first stopper 134 includes a first bolt 134a and a first nut 134b.
  • the first bolt 134a constitutes a male screw portion of the first stopper 134.
  • the first bolt 134a is inserted into the first bolt insertion hole 132a and the first bolt insertion hole 115a.
  • the first bolt 134a is elongated in the insertion direction.
  • the first nut 134b constitutes a female screw portion of the first stopper 134. As shown in FIGS. 9 to 11, the first bolt 134a is screwed into the first nut 134b, so that the fixing piece portion 132 of the connecting member 130 and the upper damper connecting portion 115 of the upper frame 114 are separated from each other. It is concluded.
  • the second stopper 135 fastens the fixed piece portion 132 of the connecting member 130 and the upper damper connecting portion 115 of the upper frame 114.
  • the second stopper 135 includes a second bolt 135a and a second nut 135b.
  • the second bolt 135a constitutes a male screw portion of the second stopper 135.
  • the second bolt 135a is inserted through the second bolt insertion hole 132b and the second bolt insertion hole 115b.
  • the second bolt 135a is elongated in the insertion direction.
  • the second nut 135b constitutes a female screw portion of the second stopper 135. Similar to the first stopper 134, the second bolt 135a is screwed into the second nut 135b to fasten the fixing piece portion 132 of the connecting member 130 and the upper damper connecting portion 115 of the upper frame 114. It
  • the assist mechanism 120 configured as described above is arranged so as to be located on the outer side (right side) in the left-right direction of the upper frame 114 and the lower frame 111. As a result, the assist mechanism 120 can be arranged at a position where it is difficult for the assist mechanism 120 to interfere with the upper frame 114 set to the lying position P1 shown in FIG.
  • the assist mechanism 120 is arranged so as to be located on the inner side (left side) in the left-right direction than the right end portion of the fender 108. This can prevent the assist mechanism 120 from contacting surrounding objects.
  • the assist mechanism 120 is arranged so as to overlap the upper frame 114 and the lower frame 111 in a side view with the upper frame 114 in the standing position P4. As a result, the aesthetic appearance of the protective frame 110 and the assist mechanism 120 in a side view can be improved. Further, since the assist mechanism 120 is not located in front of the protection frame 110, the driver sitting on the seat 109b comes into contact with the assist mechanism 120 and the visibility when the driver looks backward from the seat 109b. Can be suppressed.
  • the lower end portion of the piston rod 124 of the damper mechanism 121 and the lower damper connecting portion 112 of the lower frame 111 are connected via the lower connecting shaft 125.
  • the upper end of the cylinder tube 122 of the damper mechanism 121 and the connecting piece 131 of the connecting member 130 are connected via the upper connecting shaft 123.
  • the damper mechanism 121 is in the maximum extension state (the state where the damper mechanism 121 is extended to the maximum (the state where the piston rod 124 is projected to the cylinder tube 122 to the maximum)).
  • the first bolt 134a is inserted from above into the first bolt insertion hole 132a of the connecting member 130 and the first bolt insertion hole 115a of the upper damper connecting portion 115.
  • the axis line along the insertion direction of the first bolt 134a and the axis line along the expansion / contraction direction of the damper mechanism 121 coincide with each other in a side view.
  • the first nut 134b is arranged on the lower side of the upper damper connecting portion 115, and the first nut 134b is screwed onto the tip of the first bolt 134a.
  • the upper damper connecting portion 115 and the fixed piece portion 132 are vertically separated from each other.
  • the first bolt 134a is screwed into the first nut 134b.
  • An appropriate tool is used for the screwing.
  • the upper damper connecting portion 115 and the fixed piece portion 132 come close to each other, and the damper mechanism 121 contracts against the biasing force.
  • the first bolt 134a is screwed in until the upper damper connecting portion 115 and the fixed piece portion 132 come into contact with each other. This allows the damper mechanism 121 to be held in a contracted state.
  • the second bolt 135a is inserted from above into the second bolt insertion hole 132b of the connecting member 130 and the second bolt insertion hole 115b of the upper damper connecting portion 115. Further, similar to the first bolt 134a, the second bolt 135a is screwed into the second nut 135b arranged below the upper damper connecting portion 115. As a result, the upper damper connecting portion 115 and the fixed piece portion 132 are fastened, and the upper frame 114 and the damper mechanism 121 are connected via the connecting member 130.
  • the damper mechanism 121 can be attached to the protective frame 110 in a state in which the damper mechanism 121 is contracted by a predetermined amount from the maximum extension state.
  • the damper mechanism 121 is expanded and contracted with the swing of the upper frame 114 as described above, it is possible to prevent the damper mechanism 121 from being applied with a force to further expand it from the maximum expanded state.
  • the axis line along the insertion direction of the first bolt 134a and the axis line along the expansion / contraction direction of the damper mechanism 121 are aligned in a side view. Accordingly, the first bolt 134a can be easily screwed in against the biasing force of the damper mechanism 121.
  • the upper frame 114 swings (rotates) about the swing shaft 117 between the upright position P4 and the fall position P1. It is possible. In the present embodiment, a position in which the upper frame 114 is rotated approximately 180 degrees rearward from the standing position P4 is set as the lying position P1.
  • the tip of the upper frame 114 is located below the lower end of the assist mechanism 120 at the lying position P1.
  • the protection frame 110 can be made compact in the front-rear direction. That is, the protection frame 110 can be made compact in the front-rear direction as compared with the case where the upper frame 114 is folded so that the tip portion of the upper frame 114 is located above the lower end of the assist mechanism 120.
  • FIG. 13 shows a state in which the upper frame 114 is in a predetermined position between the upright position P4 and the lying position P1 (hereinafter referred to as “first boundary position P2”).
  • first boundary position P2 is a position in which the upper frame 114, which is the upright position P4, is rotated approximately 45 degrees toward the fall position P1 side (rear side).
  • FIG. 12 shows a state in which the upper coupling shaft 123 of the damper mechanism 121 is located on the straight line L. In this state, the damper mechanism 121 is in the most extended state as the damper mechanism 121 expands and contracts as the upper frame 114 swings. The position of the upper frame 114 in this state is hereinafter referred to as a "second boundary position P3".
  • the upper coupling shaft 123 of the damper mechanism 121 When the upper frame 114 is in the standing position P4, the upper coupling shaft 123 of the damper mechanism 121 is located closer to the standing position P4 side than the straight line L in the swinging direction of the upper frame 114. Further, in the state where the upper frame 114 is in the fall position P1, the upper coupling shaft 123 of the damper mechanism 121 is located closer to the fall position P1 side than the straight line L in the swinging direction.
  • the fall position P1 to the first boundary position P2 is referred to as the first swing region R1.
  • the first swing position P2 to the second swing position P3 is defined as the second swing area R2.
  • a region from the second boundary position P3 to the standing position P4 is defined as a third swing region R3.
  • first swing force F1 a moment of a force in the swing direction due to its own weight
  • the magnitude and direction of the first swing force F1 are determined by the weight of the upper frame 114, the position of the center of gravity, and the like.
  • the upper frame 114 is subjected to the first swinging force F1 toward the collapsed position P1 when the center of gravity is located on the collapsed position P1 side (rear side) with respect to the swing shaft 117. Further, in the state in which the center of gravity of the upper frame 114 is located on the standing position P4 side (front side) with respect to the swing shaft 117, the first swinging force F1 is applied to the standing position P4 side. Further, when the center of gravity of the upper frame 114 is at a position (a center of gravity boundary position) on a straight line in the vertical direction passing through the swing shaft 117 in a side view, the first swing force F1 is 0.
  • the upper frame 114 is at the center-of-gravity boundary position at the predetermined position of the second swing region R2. That is, in the present embodiment, in a state where the upper frame 114 is located in the first swing region R1 and a state where the upper frame 114 is located closer to the fall position P1 than the center of gravity boundary position in the second swing region R2. A first swinging force F1 toward the lying position P1 is applied to the upper frame 114. In the present embodiment, the upper frame 114 is located closer to the standing position P4 than the center of gravity boundary position in the second swing region R2 and the upper frame 114 is located in the third swing region R3. The first swinging force F1 toward the standing position P4 is applied to the upper frame 114.
  • second swing force F2 a moment of a force in the swing direction by the damper mechanism 121 (hereinafter referred to as “second swing force F2”) is applied to the upper frame 114.
  • the magnitude and direction of the second swing force F2 are determined by the biasing force of the damper mechanism 121, the positions of the upper connecting shaft 123 and the lower connecting shaft 125, and the like.
  • the damper mechanism 121 Urges the upper frame 114 toward the standing position P4. In this state, the second swinging force F2 toward the standing position P4 is applied to the upper frame 114. Further, in a state in which the upper coupling shaft 123 is located on the standing position P4 side in the swing direction of the upper frame 114 with respect to the straight line L (a state in which the upper frame 114 is located in the third swing region R3), the damper mechanism 121 is , The upper frame 114 is biased toward the lying position P1. In this state, the second swinging force F2 toward the collapsed position P1 is applied to the upper frame 114. Further, when the upper connecting shaft 123 is located on the straight line L, the second swinging force F2 becomes zero.
  • the second swing force F2 toward the standing position P4 is gradually reduced as the upper frame 114 rotates so as to approach the second boundary position P3. . Further, in the third swing region R3, as the upper frame 114 at the second boundary position P3 rotates so as to approach the standing position P4, the second swing force F2 toward the fall position P1 side gradually increases.
  • the assist mechanism 120 is configured such that, in the first swing region R1, the first swing force F1 toward the lying position P1 side is larger than the second swing force F2 toward the standing position P4 side. Further, the assist mechanism 120 is configured such that, in the second swing region R2, the first swing force F1 toward the fall position P1 side is smaller than the second swing force F2 toward the standing position P4 side.
  • the assist mechanism 120 is configured such that, in the third swing region R3, the first swing force F1 toward the standing position P4 side is larger than the second swing force F2 toward the fall position P1 side. That is, as described above, in the third swing region R3, the direction of the second swing force F2 of the damper mechanism 121 changes from the standing position P4 side to the fall position P1 side, but it is more than the second swing force F2. The first swinging force F1 toward the standing position P4 due to the weight of the upper frame 114 increases.
  • the upper frame 114 at the fall position P1 is moved to the upright position P4 side of the upper frame 114 by the second pin insertion hole 113c and the fixing pin 118 inserted through the hole formed in the upper frame 114. Rotation is restricted. Therefore, first, the fixing pin 118 inserted into the second pin insertion hole 113c and the hole formed in the upper frame 114 is removed to make the upper frame 114 rotatable.
  • the upper frame 114 that is in the lying position P1 is located in the first swing region R1.
  • the center of gravity of the upper frame 114 is located on the fall position P1 side, and thus the first swing force F1 is applied to the fall position P1 side.
  • the assist mechanism 120 is configured such that the first swing force F1 toward the lying position P1 side is larger than the second swing force F2 toward the standing position P4 side. Therefore, when the upper frame 114 at the fall position P1 shown in FIG. 14 is displaced to the standing position P4 side, a manual swing operation by the operator is required.
  • the upper coupling shaft 123 of the damper mechanism 121 is located closer to the fall position P1 side than the straight line L in the swing direction. In this state, the damper mechanism 121 biases the upper frame 114 toward the standing position P4. Therefore, in the first swing region R1, the force required for the swing operation when displacing the upper frame 114 from the fall position P1 to the standing position P4 can be reduced by the biasing force of the damper mechanism 121.
  • the upper frame 114 reaches the second swing region R2 by the swing operation. Even in this state, the upper connecting shaft 123 of the damper mechanism 121 is located closer to the fall position P1 side than the straight line L in the swing direction, and therefore the damper mechanism 121 biases the upper frame 114 to the standing position P4 side.
  • the upper frame 114 is configured to be the center of gravity boundary position at the predetermined position of the second swing region R2. Therefore, in the second swing region R2, the first swing force F1 toward the collapse position P1 is applied to the upper frame 114 when the upper frame 114 is located closer to the collapse position P1 than the center of gravity boundary position. On the other hand, in a state where the upper frame 114 is located on the standing position P4 side with respect to the center of gravity boundary position, the first swinging force F1 toward the standing position P4 side is applied to the upper frame 114.
  • the assist mechanism 120 is configured such that the first swing force F1 toward the lying position P1 side is smaller than the second swing force F2 toward the standing position P4 side. There is. Therefore, in the second swing region R2, the upper frame 114 can be automatically erected. That is, in the second swing region R2, in a state in which the upper frame 114 is located closer to the fall position P1 side than the center of gravity boundary position, the upper frame 114 resists the first swing force F1 to the fall position P1 side and stands upside P4. The upper frame 114 can be automatically erected by the second swinging force F2 to.
  • the upper frame 114 is automatically driven by the first swinging force F1 toward the standing position P4 side and the second swinging force F2 toward the standing position P4 side. 114 can be raised.
  • the upper frame 114 that automatically stands up reaches the third swing region R3.
  • the upper frame 114 since the upper frame 114 is located closer to the standing position P4 than the center of gravity boundary position, the upper frame 114 has the first swing force on the standing position P4 side. F1 is added.
  • the upper coupling shaft 123 of the damper mechanism 121 is located closer to the standing position P4 side than the straight line L in the swing direction. In this state, the damper mechanism 121 biases the upper frame 114 toward the falling position P1. Further, as described above, in the present embodiment, in the third swing region R3, the first swing force F1 toward the standing position P4 side is larger than the second swing force F2 toward the fall position P1 side. It is configured. Accordingly, the upper frame 114 can be automatically erected in the third swing region R3.
  • the front surface of the upper frame 114 comes into contact with the inside of the upper frame connecting portion 113, so that the upper frame 114 is prevented from further rotating forward.
  • the urging force of the damper mechanism 121 can reduce the impact of the upper frame 114 on the upper frame connecting portion 113.
  • the fixing pin 118 is inserted into the first pin insertion hole 113b and the hole formed in the upper frame 114, so that the upper frame 114 is rotated toward the fall position P1. Can be regulated.
  • the fixing pin 118 inserted into the first pin insertion hole 113b and the hole formed in the upper frame 114 is removed to make the upper frame 114 rotatable.
  • the upper frame 114 set to the standing position P4 is located in the third swing region R3.
  • the assist mechanism 120 is configured such that the first swing force F1 toward the standing position P4 is larger than the second swing force F2 toward the fall position P1. Has been done. Therefore, when the upper frame 114 at the standing position P4 is displaced to the fall position P1 side, a swing operation by the operator is required.
  • the damper mechanism 121 biases the upper frame 114 toward the collapsed position P1. Therefore, it is possible to assist the swinging operation when the upper frame 114 starts to be tilted to the laid-down position P1 side by the urging force of the damper mechanism 121.
  • the upper frame 114 reaches the second swing region R2 by the swing operation.
  • the assist mechanism 120 is configured such that the first swing force F1 toward the lying position P1 side is smaller than the second swing force F2 toward the standing position P4 side. ing. Therefore, also in the second swing region R2, when the upper frame 114 is displaced to the lying position P1 side, a swing operation by the operator is required.
  • the direction of the first swing force F1 is the collapse position P1 side. It is possible to assist the swinging operation to the lying position P1 side.
  • the upper frame 114 reaches the first swing region R1 by the swing operation.
  • the assist mechanism 120 is configured such that the first swing force F1 toward the lying position P1 side is larger than the second swing force F2 toward the standing position P4 side. Has been done. Thereby, the upper frame 114 can be automatically laid down in the first swing region R1. Further, the urging force of the damper mechanism 121 can prevent the upper frame 114 from swinging vigorously due to its own weight.
  • the upper frame 114 swings to the standing position P4 side. Movement can be regulated.
  • the tractor 101 (work vehicle) according to the present embodiment is It has a lower frame 111 fixed to the rear of the seat 109b, and an upper frame 114 connected to the upper part of the lower frame 111 via a swing shaft 117 so as to be swingable (rotatably) back and forth.
  • the assist mechanism 120 is The upper frame 114 is provided with a damper mechanism 121 (urging mechanism) capable of urging the upper frame 114 toward the standing position P4 in the swinging direction of the upper frame 114.
  • a damper mechanism 121 urging mechanism
  • the urging force of the damper mechanism 121 can be used to assist the swinging operation of the upper frame 114. That is, by using the urging force of the damper mechanism 121, it is possible to reduce the force required for the rocking operation when the upper frame 114 is displaced from the lying position P1 to the standing position P4. Further, by using the urging force of the damper mechanism 121, when the upper frame 114 is displaced from the standing position P4 to the fall position P1, it is possible to suppress the upper frame 114 from swinging vigorously due to its own weight.
  • the assist mechanism 120 is In a state where the upper frame 114 is located closer to the fall position P1 (first swing region R1) than the first boundary position P2 (boundary position) between the standing position P4 and the fall position P1,
  • the swinging force (second swinging force F2) applied to the upper frame 114 by the damper mechanism 121 to the upright position P4 (second swinging force F2) is applied to the upper frame 114 by the weight of the upper frame 114.
  • Smaller than the first swinging force F1 In a state where the upper frame 114 is located in a predetermined range (second swinging region R2) on the side of the standing position P4 from the first boundary position P2, the standing position added to the upper frame 114 by the damper mechanism 121.
  • the swinging force to P4 (the second swinging force F2) is larger than the swinging force (first swinging force F1) to the lying position P1 applied to the upper frame 114 by the own weight of the upper frame 114.
  • the upper frame 114 in a state in which the upper frame 114 is located on the laid position P1 side (first swing region R1) with respect to the first boundary position P2, the upper frame 114 can be automatically laid down. Further, in a state in which the upper frame 114 is located within a predetermined range (second swing region R2) on the standing position P4 side with respect to the first boundary position P2, the upper frame 114 can be automatically stood.
  • the assist mechanism 120 is An upper connection shaft 123 that rotatably connects the upper frame 114 and the damper mechanism 121, and a lower connection shaft 125 that rotatably connects the lower frame 111 and the damper mechanism 121 are provided.
  • the damper mechanism 121 is It is expandable and contractable, and is configured to urge the upper connecting shaft 123 and the lower connecting shaft 125 to be separated from each other along the expanding and contracting direction,
  • the upper connecting shaft 123 is In a state where the upper frame 114 is in the standing position P4, the upper frame 114 is located on the standing position P4 side in the swinging direction with respect to the straight line L passing through the lower connecting shaft 125 and the swinging shaft 117 in a side view. Then When the upper frame 114 is in the lying position P1, the upper frame 114 is located on the lying position P1 side in the swing direction with respect to the straight line L.
  • the damper mechanism 121 causes the upper frame 114 to rise to the standing position P4. By urging it to the side, the swinging operation can be assisted.
  • the damper mechanism 121 biases the upper frame 114 to the fall position P1 side. As a result, the impact generated when the upper frame 114 reaches the standing position P4 can be mitigated. It also assists the rocking operation when starting to tilt the upper frame 114 from the standing position P4 to the lying position P1.
  • the assist mechanism 120 is A connecting member 130 rotatably connected to the damper mechanism 121 via the upper connecting shaft 123; A first bolt 134a (screw) for fixing the connecting member 130 to the upper frame 114, With The connecting member 130 is The first bolt 134a is configured to be inserted in the expansion / contraction direction of the damper mechanism 121, and the first bolt 134a is screwed into the upper frame 114 side to hold the damper mechanism 121 in a contracted state. It is a thing.
  • the mountability of the damper mechanism 121 to the upper frame 114 can be improved. That is, the damper mechanism 121 needs to be contracted by a predetermined amount and attached to the damper mechanism 121 in the maximum extension state in order to suppress a further force from being applied in the extension direction.
  • the damper mechanism 121 is contracted easily by using the screwing of the first bolt 134a to easily contract the damper mechanism 121. In this state, it can be fixed to the upper frame 114.
  • an axis line along the insertion direction of the first bolt 134a and an axis line along the expansion / contraction direction of the damper mechanism 121 are: They are provided so as to coincide with each other in a side view.
  • the connecting member 130 is The upper frame 114 is provided with a notch portion 133 that avoids at least a part of the damper mechanism 121 when the upper frame 114 is in the lying position P1.
  • the biasing mechanism (damper mechanism 121) is
  • the damper mechanism 121 has a biasing force by a spring.
  • the structure of the biasing mechanism (damper mechanism 121) can be simplified. That is, the configuration can be simplified as compared with a case in which the swing operation of the protection frame 110 is assisted by using a hydraulic cylinder that requires oil supply or an electric cylinder that requires power supply.
  • the assist mechanism 120 is It is located outside the upper frame 114 and the lower frame 111 in the left-right direction.
  • the assist mechanism 120 can be arranged at a suitable position.
  • the assist mechanism 120 is The fender 108, which is disposed so as to cover the rear wheel 107 of the tractor 101, is located on the inner side in the left-right direction than the outer end in the left-right direction.
  • the upper frame 114 In the lying position P1, the end portion on the side opposite to the lower frame is located below the lower end of the assist mechanism 120.
  • the protection frame 110 can be made compact in the front-rear direction.
  • the tractor 101 according to the present embodiment is an embodiment of the work vehicle according to the present invention.
  • the lower frame 111 according to this embodiment is an embodiment of the first frame according to the present invention.
  • the upper frame 114 according to this embodiment is an embodiment of the second frame according to the present invention.
  • the damper mechanism 121 according to the present embodiment is an embodiment of the urging mechanism according to the present invention.
  • the first bolt 134a according to the present embodiment is an embodiment of the screw according to the present invention.
  • the first boundary position P2 according to the present embodiment is an embodiment of the boundary position according to the present invention.
  • the second swing region R2 according to the present embodiment is an example of the predetermined range according to the present invention.
  • the assist mechanism 120 is provided on the right side of the protection frame 110, but the configuration is not limited to this.
  • the assist mechanism 120 may be provided on the left side of the protective frame 110, or the assist mechanism 120 may be provided on both left and right sides of the protective frame 110.
  • the assist mechanism 120 is provided outside the lower frame 111 in the left-right direction, but the assist mechanism 120 may be provided inside the lower frame 111 in the left-right direction.
  • the center of gravity of the upper frame 114 is located on a straight line passing through the swing shaft 117 in a side view (center of gravity boundary position).
  • the configuration is not limited to this. That is, the center-of-gravity boundary position is determined according to the shape of the upper frame 114 and the like, and is not limited to the example described above.
  • the shapes of the upper frame 114 and the lower frame 111 are not limited to those described above, and various shapes can be adopted.
  • the upper frame 114 is positioned at the upright position P4 and the upper portion (the portion on the side opposite the lower frame) is bent forward, but the configuration is not limited to this. Instead, the upper frame 114 may be linear in a side view.
  • the predetermined range according to the present invention (the range in which the second swinging force F2 to the standing position P4 is larger than the first swinging force F1 to the fall position P1) is the second swinging region R2.
  • the predetermined range may be the second swing area R2 and the third swing area R3. That is, in the swing range of the upper frame 114, in the range from the first boundary position P2 to the standing position P4, the second swing force F2 to the standing position P4 is larger than the first swing force F1 to the fall position P1.
  • the configuration may be large.
  • the upper coupling shaft 123 when the upper frame 114 is in the standing position P4, the upper coupling shaft 123 is located on the standing position P4 side of the upper frame 114 in the swinging direction with respect to the straight line L. It is not limited to such a configuration. For example, in a state where the upper frame 114 is in the upright position P4, the upper coupling shaft 123 may be located closer to the fall position P1 side than the straight line L in the swinging direction of the upper frame 114.
  • first swing region R1, the second swing region R2, and the third swing region R3 in the present embodiment are examples, and are not limited to the above.
  • the first swing region R1, the second swing region R2, and the third swing region R3 can be set appropriately in the swing range of the upper frame 114.
  • the damper mechanism 121 is connected to the upper frame 114 via the connecting member 130, but the structure is not limited to this.
  • the damper mechanism 121 may be directly connected to the upper frame 114.
  • the damper mechanism 121 is configured by the gas spring, but the configuration is not limited to such a configuration.
  • the damper mechanism 121 one having an urging force of various springs can be adopted.
  • the damper mechanism 121 is not limited to one having a biasing force by a spring, and various configurations can be adopted.
  • the second embodiment of the present invention relates to a work vehicle provided with the lops in a state of being erected from the vehicle body.
  • the lops are divided into a lower divided body located on the vehicle body side and an upper divided body located on the upper side, and the upper divided body acts vertically on the lower divided body.
  • the characteristic configuration of the work vehicle according to the present invention is that the lops erected from the vehicle body are divided into a lower divided body located on the vehicle body side and an upper divided body located on the upper side, and the upper divided body is A gas damper provided between the lower divided body and the upper divided body so as to be pivotally connected to the lower divided body in a vertically acting posture and in a folding posture in which the lower divided body is bent.
  • the gas damper is attached so as to be in a free state in which neither extension force nor contraction force is generated when the upper divided body is in an intermediate position between the vertically acting posture and the folded posture.
  • a point is provided with a position holding mechanism capable of fixing and releasing the position of the body in a rotating position corresponding to the intermediate position.
  • the gas damper when changing the posture of the lops, for example, when switching from the folding posture to the vertically acting posture, it is necessary to rotate the upper divided body upward from the folding posture. At this time, the gas damper is shorter than the free state until the intermediate position is reached, and the extension force is generated.
  • the extension force of the gas damper can assist the manual operation, and the turning operation can be performed easily.
  • the upper split body rotates toward the vertically acting posture while the manual operation force is applied with the auxiliary operation force of the gas damper, there is a risk of vigorous rotation and shock.
  • the gas damper becomes shorter than in the free state, and a degenerate force is generated.
  • the momentum is relieved by the degeneration force of the gas damper, and the disadvantage such as a shock occurring in the vertically acting posture can be avoided.
  • the upper split body is fixed in position at the rotation position corresponding to the intermediate position. If the upper divided body is in the middle position, the gas damper will be in a free state.Therefore, if the gas damper is attached or detached in this state, neither extension nor contraction force will be generated in the gas damper, so an unreasonable force may be applied. Work can be done easily.
  • the upper divided body has a first rotation position corresponding to the vertically acting posture, a second rotation position corresponding to the intermediate position, and a third rotation position corresponding to the folding posture. It is preferable that the position holding mechanism is rotatably supported over and can be fixed and released at each of the first rotation position, the second rotation position, and the third rotation position. Is.
  • the position holding mechanism can fix the position of the upper divided body not only at the intermediate position but also in each of the vertically acting posture and the folding posture.
  • the structure for holding the position the structure can be simplified as compared with the case where different fixing mechanisms are provided.
  • the position holding mechanism includes a connecting pin that is removably inserted across an insertion hole formed in the upper divided body and an insertion hole formed in the lower divided body, and A plurality of insertion holes on the side of the upper divided body or a plurality of insertion holes on the side of the lower divided body are formed at different positions in the circumferential direction, and the connecting pin is inserted by replacing it with one of the plurality of insertion holes. Accordingly, it is preferable that the position can be held at each of the first rotation position, the second rotation position, and the third rotation position.
  • the present invention when defining the front-back direction of the machine body, it is defined along the machine body traveling direction in the working state, and when defining the left-right direction of the machine body, when defining the machine body traveling direction, Define. That is, the direction indicated by the symbol (F) in FIGS. 16 and 17 is the front side of the machine body, and the direction indicated by the symbol (B) in FIG. 16 is the rear side of the machine body.
  • the direction indicated by reference numeral (R) in FIG. 17 is the right side of the machine body, and the direction indicated by reference numeral (L) in FIG. 17 is the left side of the machine body.
  • the tractor illustrated in the present embodiment is located inside a pair of left and right front wheels 1 that can be steered, a pair of left and right rear wheels 2 that have a fixed orientation, and a hood 3 at the front of the vehicle body.
  • the driving unit 4 includes a driving unit 5 located on the upper side of the rear part of the vehicle body, a lopes 7 located on the rear part of the driving unit 5 and extending upward from the vehicle body frame 6, and the like.
  • the vehicle body frame 6 is provided with left and right main frames 9 made of steel plate and long in the front-rear direction, a rear side support frame 10 connecting the rear parts of the left and right main frames 9, and the like.
  • the driver's seat 13 is arranged in a state where the driver's seat 5 is located above the transmission 12, and a driver's seat step 14 on which the driver can board is provided within the gap between the driver's seat 13 and the driving part 4 in the front-rear direction.
  • Rear wheel fenders 15 are provided on both the left and right sides of the driver's seat 13.
  • An operation panel section 16 is provided at a portion of the motive section 4 on the rear side of the hood 3.
  • the operation panel portion 16 is provided with a steering wheel 17 for steering front wheels, a plurality of operating tools, and instruments.
  • the prime mover 4 includes a radiator 18 for cooling the engine, a fan 19 for cooling, an air cleaner 20, a muffler 21, and the like.
  • ROPS 7 is configured as follows. As shown in FIGS. 18 and 19, the lops 7 are divided and formed into left and right column members 22 as a lower divided body located on the vehicle body side and an arch member 23 as an upper divided body located on the upper side.
  • the left and right pillar members 22 are located on the left and right sides on the rear side of the driver's seat 13, and the arch members 23 are connected in a substantially arched shape when viewed in the front-rear direction. Has been done.
  • the arch member 23 has a shape that bends so that the upper side thereof is located closer to the front side of the machine body in a side view in the vertically acting posture.
  • the lower portions of the left and right support members 22 are respectively inserted into the pipe-shaped left and right support portions 24 provided on the rear side support frame 10 and fixed by bolt connection to be firmly supported.
  • the back cover member 25 is attached in a state of being installed over the lower parts of the left and right support members 22.
  • the back cover member 25 is provided with a resin net 26 located at the upper portion and a sheet metal plate 27 located at the lower portion.
  • reference numeral 28 is an indicator lamp which functions as a direction indicator or a hazard lamp.
  • the left and right support members 22 and arch members 23 are made of rectangular steel pipes having a rectangular cross section.
  • the arch member 23 is rotatably supported between a vertically acting posture connected to the upper side of the left and right column members 22 and a folding posture in which it is bent rearward and downward, and can maintain its position in the vertically acting posture and the folding posture. Supported by.
  • the connecting portion 29 is continuously provided on the lower end portion of the arch member 23 so as to be integrally rotated.
  • the connecting portion 29 includes a pair of left and right plate members 30 in a state of being integrally fixed to the left and right side surfaces of the lower end portion of the arch member 23.
  • the pair of left and right plate members 30 are positioned so that the upper portions of the column members 22 are overlapped on the left and right sides.
  • the left and right plate members 30 are formed with insertion holes 32 through which the bolts 31 are inserted to form a pivotal fulcrum.
  • the left and right plate members 30 are provided with three positioning through holes 34 through which the connecting pins 33 are inserted.
  • the positioning insertion holes 34 are formed in different positions in the circumferential direction with the same distance from the rotation fulcrum P formed by the bolt 31.
  • a cylindrical boss member 35 is fixedly attached to the upper portion of the column member 22.
  • Reinforcing ribs 36 are integrally connected between the lower side of the boss member 35 and the side surface of the column member 22 so as to enhance the support strength of the boss member 35.
  • the bolt 31 is inserted through the insertion hole 32 for forming the rotation fulcrum formed in the left and right plate members 30 and the insertion hole 37 inside the boss member 35, and the tip end of the bolt 31 is tightened with the nut 38. It is fixed.
  • a rotation fulcrum P is formed by the bolt 31.
  • a single through hole 39 for positioning is formed in the upper part of the pillar member 22 in a state of penetrating the pillar member 22 in the lateral direction.
  • the connecting pin 33 is inserted into one of the insertion holes 39 of the column member 22 and the three insertion holes 34 formed in the left and right plate members 30, the arch member 23 is inserted. It can be fixed and held in position.
  • the arch member 23 By inserting the connecting pin 33 by replacing the three insertion holes 34 with each other, the arch member 23 has the first rotation position C1 (see FIG. 21) corresponding to the vertically acting posture and the second rotation position corresponding to the intermediate position. It is supported so as to be positionally fixable at a rotation position C2 (see FIG. 22) and a third rotation position C3 (see FIG. 23) corresponding to the folding posture. That is, the three insertion holes 34 are formed at the positions corresponding to the respective rotational positions.
  • the connecting pin 33 prevents the connecting pin 33 from coming off by the retaining pin 40 in the inserted state.
  • a gas damper 41 is provided across the left connecting portion 29 of the arch member 23 and the left strut member 22. As shown in FIG. 22, the gas damper 41 is attached so that when the arch member 23 is in the second rotation position C2, neither extension force nor contraction force is generated.
  • the turning fulcrum P is at the inner side in the left-right direction of the left connecting portion 29.
  • An upper end portion of the gas damper 41 is pivotally connected to a position located on the front side of the position through the support bracket 42.
  • the lower end of the gas damper 41 is located at the inner side in the left and right direction and at a position slightly rearward of the rear surface of the column member 22 via the support bracket 43. The parts are pivotally connected.
  • the gas damper 41 overlaps with the position of the rotation fulcrum P in a side view, and is in the longest stretched state. That is, it is in a free state in which neither extension nor contraction is generated.
  • the upper end portion of the gas damper 41 is at a position closer to the front side with respect to the rotation fulcrum P. , The longest stretched state is degenerated.
  • the arch member 23 is in the third rotation position C3 (folding posture)
  • the upper end portion of the gas damper 41 is located closer to the front side with respect to the rotation fulcrum P, and The long stretched state is degenerated.
  • knob-attached bolts 44 are provided on the front side portions of the left and right connecting portions 29. Although not described in detail, the bolt 44 can be firmly fixed in position by tightening when the arch member 23 is in the vertically acting posture.
  • the third rotation position C3 folding posture
  • the extension force of the gas damper 41 acts as an auxiliary force when the arch member 23 is rotated by a manual operation, so that the labor load can be reduced.
  • the gas damper 41 is again in the retracted state and the extension force acts, so that the arch member 23 exerts a braking function.
  • the rope 7 according to the present embodiment is an embodiment of the protection frame according to the present invention.
  • the column member 22 (lower divided body) according to the present embodiment is an embodiment of the first frame according to the present invention.
  • the arch member 23 (upper divided body) according to the present embodiment is an embodiment of the second frame according to the present invention.
  • the gas damper 41 according to the present embodiment is an embodiment of the assist mechanism according to the present invention.
  • the arch member 23 (upper divided body) has a shape in which the arch member 23 is bent such that the upper side is located closer to the front side of the machine body in a side view in the vertically acting posture. Instead, it may have a linearly extending shape.
  • a plurality of insertion holes 34 on the side of the arch member 23 are formed at different positions in the circumferential direction, but on the side of the support member 22 (lower divided body).
  • a plurality of insertion holes 39 may be formed at different positions in the circumferential direction.
  • the position holding mechanism IH positions the arch member 23 (upper divided body) at each of the first rotation position C1, the second rotation position C2, and the third rotation position C3.
  • the position holding mechanism IH has a structure in which the position of the arch member 23 can be fixed and released only at the second rotation position C2 and the first rotation position C1.
  • the fixing mechanism capable of fixing the position of the arch member 23 at each of the third rotation positions C3 may be provided separately from the position holding mechanism.
  • the present invention can be applied to work vehicles such as tractors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Agricultural Machines (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

L'invention concerne un véhicule de travail dans lequel une opération de rotation d'un bâti de protection (110) peut être assistée.　Selon la présente invention, un tracteur (101) est pourvu d'un bâti de protection (110) qui a un bâti inférieur (111) et un bâti supérieur (114) relié rotatif à une section supérieure du bâti inférieur (111). Le tracteur est pourvu d'un mécanisme d'assistance (120) qui assiste l'opération de rotation du bâti supérieur (114).
PCT/JP2019/022594 2018-10-12 2019-06-06 Véhicule de travail WO2020075341A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US17/282,784 US11414035B2 (en) 2018-10-12 2019-06-06 Work vehicle
EP19871966.8A EP3865353B1 (fr) 2019-06-06 Véhicule de travail

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2018193194A JP7005465B2 (ja) 2018-10-12 2018-10-12 作業車
JP2018-193194 2018-10-12
JP2018-213064 2018-11-13
JP2018213064A JP6959213B2 (ja) 2018-11-13 2018-11-13 作業車

Publications (1)

Publication Number Publication Date
WO2020075341A1 true WO2020075341A1 (fr) 2020-04-16

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PCT/JP2019/022594 WO2020075341A1 (fr) 2018-10-12 2019-06-06 Véhicule de travail

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US (1) US11414035B2 (fr)
WO (1) WO2020075341A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP7335206B2 (ja) * 2020-06-29 2023-08-29 株式会社クボタ 作業車

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JP2013014207A (ja) * 2011-07-04 2013-01-24 Mitsubishi Agricultural Machinery Co Ltd 作業車両の安全フレーム
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Also Published As

Publication number Publication date
US11414035B2 (en) 2022-08-16
EP3865353A4 (fr) 2022-06-22
EP3865353A1 (fr) 2021-08-18
US20210387587A1 (en) 2021-12-16

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